Packing-ring.



No. 816,478. PATENTED MAR. 27, 1906.

' H. KIRSCHNING, DBGD.

n. A. Kmsonmm, ADMINISTBATBIX. PACKING RING.

P T 9 AP LIOA ION FILED JAN 17, 1 06 2 SHE T 2.

UNITED STATES PATENT orrron.

EMMA AMALIE KIRSCHNING, OF BERLIN, GERMANY, ADMINISTRATRIX OF HERMANNKIRSOHNING, DECEASED.

PACKING-RING.

Specification of Letters'Patent.

Patented March 27, 1906.

To all whom it may concern.-

Be it known that HERMANN KIRSOHNING, deceased, late a subject oftheGerman Emperor, and a resident of 132 Ackerstrasse, Ber- -'n, Germany,did invent certain new and useful Improvements in Packing-Rings, ofwhich the following is a specification.

This invention relates to improvements in packing-rin s produced in theknown manner by spira ly winding or rolling up strips of flexiblematerial.

The novel feature of the improved packing-rings lies in the fact thatadjacent coils or convolutions of the said strips of material are madein the form of troughs, channels, or the I like'th'at is to say, thesurface of the strips is protuberant or convex on one side and recessedor concave on the other side, so that the protuberant surface of onecoil is adapted to engage the recessed surface of the adjacent coilsomewhat in the manner of a so-called feather or spline. The protuberantand recessed surfaces need not be continuous. If desired, certainportions-or sections of each coil may remain substantially cylindrical,but

- in that case also the arrangement is of course such that therotuberant surface parts of each coil coinci e with recessed surfaceparts of the adjacent coil. By'this means the durabilit of the rings isconsiderably increased, and t e accidental unwinding or lateralspreading thereof, by which'they may drop out of the joints to be madetight, is prevented. In the absence of the spline and groove connectionsreferred to the unwinding or spreading of the bent strips isparticularly liable to. occur when the rin has become hot and wet. If,for examp e, an adhesive substance has been used to interconnect thecoils of material, the said substance is of course rendered soft byheatand moisture.

For producing a packing-ring according to the present invention a singlestrip of material can be wound up in the manner indicated, or'a pluralitof such strips, wound separately or toget er, can be used. The materialof which the strips consist varies, of course, according to the natureof the requirements. Fiber, asbestos, india-rubber, and the like can,for example, be used, and, if desired, strips of various materials canbe made-to alternate with each other in the construction of a singlering. Thus, for instance,

strips of strong fibrous material can be used alternately with strips ofsofter material, such as woven fabric or asbestos, and the rings can bestrengthened by means of rims, stays, trusses, or the like, of metal orother substantially rigid material.

' Theterm packing-ring used in connection with the present inventionincludes, of

course, annular, elliptical, 'and polygonal packings.

The invention will be fully understood upon reference to theaccompanying drawings,inwhich.

Figures 1- and 2 are respectivel a crosssection and a plan of theunfinishe packing ring. Figs. 3 and 4 are res ectivel a cross--sectionand a plan of a finis ed ac 'ng-r'ing. Figs. 5 and 6,respectively, an Fi s. 7 and 8 are respectively cross-sections an plansof otherwise bended packing-rings.

In the first place a strip or strips of fiat flexible material ormaterials are wound up 3 and 4 the strip of material forming the coi s bis bent in such a manner that in cross-section each part of the strip isV-shaped, with the apex c of the V directed toward the outercircumference of the ring.

Figs. 5 and 6 illustrate a form of construction 1n which the outer coilsd" are outwardly bent, the inner coils e being inwardly bent.

The outermost and innermost coils'are bent at more acute angles than thecolls between them, the acuteness of the sald angles decreasing as thecentral coil f of the layer is a I roached. The said coil f is notangular y cut atall; but both its inner and its outer surface areslightly angular in order to fit a ainst the respective adjacentcoil-surfaces. TIie bending of the strips in the manner shown in Figs. 3and 5 can either be efiected between suitably-shaped wheels or cylindersacting in lateral direction or by means of lateral pressure exerted onthe wound strip with the aid of a suitably-shaped tool.

The packing-ring shown in Flgs. 3 and 4 comprises an internal ring orlayer m of metal or the like. If desired, a similar ring or layer can beplaced round the external circumference of the outermost coil 6.Metallic stri s can of course also be inserted between t e strips orcoils forming the packing-ring.

In the form of construction shown in Fi s. 7 and 8 the strips ofmaterial of which t e packing-rm is formed are not so sharply bent as int e ring shown in Fig. 5; but the degree of convexlty and concavity ofthe outer and inner coils d and e also decreases as the central coil fis approached, the latter having two convex surfaces. This formation ofthe ring is preferably produced by means of powerful axial pressureafter the flat strips have been wound, the said pressure being, forexample, exerted by means of a press.

The lon itudinal bending, channeling, or grooving of the stri s by meansof axial pressure exerted on tfie wound ring produces very intimateinterconnection of the coils and great stren th is imparted to the ring,more articular y if the arrangement is so madet at thefiber, grain, orthelike of the material runs in the longitudinal direction of thestrips, so that the greatest possible amount of tensile strength is oposed to steam-pressure or the like to whic the ring is subjected. Thepassage of steam or other fluid between the coils is effectuallyprevented by the improved arrangement even in the case of large-ringssuch as those placed around manhole-doors and the like. If desired, thestrips of material can be suitably impregnated before being wound, orthe rings can be sheathed in a suitable manner after the strips havebeen wound. Neither of these 0 erations is novel in connection with pac(ingrings.

What is claimed as the invention, and de sired to be secured by LettersPatent of the United States, is

1. A packing-ring consisting of s irallywound strips of flexiblematerial; eac winding of the strips being provided with projectionsengaging with corresponding recesses in the adjacent winding.

2. A packing-ring consisting of s irally wound strips of flexlblematerial; eac winding of the strips being provided with a lon itudinalprojection extending throughout t e winding and engaging with acorresponding longitudinal recess in the adjacent winding.

3. A packing-ring consisting of spirallywound strips; each winding ofthe strips being concave-convex and the concave portion of each windingengaging with the convex portion of the adjacent winding.

The foregoing s ecification signed at Berlin this 15th day 0 December,1905.

EMMA AMALIE KIRSCHNING, Admtnistmtriw 0 the estate of HermannKirschmlng, eceased. In presence of WOLDEMAR HAUBT, HENRY HASBER.

